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Frame Back Fill Requirements

The following table details the back fill requirements for fire resistant metal door frames under AS1905.1-2005.

Under the current Australian Standard AS1905.1-2005, EVERY fire resistant metal door frame is required to be back filled.

Wall Type

Doorset Type

Maximum Door Leaf Size in mm

Frame Thickness in mm

FRL up to

Masonry - Built in or Retrofit

MINI Single Leaf

2350 x 1200

1.1

---/120/30

MAXI Single Leaf

2400 x 1200

1.4

---/120/30

Masonry - (Built in only)

MAXI Single Leaf

3500 x 1200
3000 x 1500

1.4

---/240/30

Masonry - Built in or Retrofit

MAXI Double Leaf

2400 x 2400

1.4

---/120/30

Masonry - (Built in only)

MAXI Double Leaf

3500 x 2400
3000 x 3000

1.4

---/240/30

Plasterboard

MINI Single Leaf

2350 x 1200

1.1

---/120/30

MAXI Single Leaf

2400 x 1200

1.4

---/120/30

MAXI Single Leaf

3000 x 1500

1.4

---/180/30

MAXI Double Leaf

2400 x 2400

1.4

---/120/30

Hebel Wall

MINI Single Leaf

2350 x 1200

1.4

---/120/30

MAXI Single Leaf

2400 x 1200

1.4

---/120/30

MAXI Double Leaf

2400 x 2400

1.4

---/120/30

Rapidwall Wall Systems

MINI Single Leaf

2350 x 1200

1.4

---/120/30

MAXI Single Leaf

2400 x 1200

1.4

---/120/30

MAXI Double Leaf

2400 x 2400

1.4

---/120/30

FRAMES FOR THE DOORS AS DETAILED ABOVE ARE REQUIRED TO BE BACK FILLED TO BE IN ACCORDANCE WITH THE REQUIREMENTS OF AS1905.1-2005

Previous revisions of this standard allowed for frames in certain circumstances to be unfilled but due to more stringent testing under AS1530.4, it is now required for all fire resistant frames to be backfilled if certified in accordance with the provisions of AS1905.1-2005 unless evidence of a test or opinion in accordance with AS1530.4-2005 can be provided to support the installation.

If you have existing installations that pre date 2005 and would like to find out the requirements at that time we would recommend you seek the advise of a fire engineer or building certifier or contact your fire services provider who may be able to assist.